Masanori Ozaki

Graduate School of Engineering, Osaka University
Professor
A03

Research AreasElectronics materials and devices
Participating Group (2020-2021)

Development of printable soft-crystal electronic devices utilizing potential liquid-crystalline properties

Keywords
liquid crystal, organic semiconductor, polymorphic transformation, phthalocyanine, organic electronics
Co-Researcher
Co-Researcher: Akihiko Fujii(Graduate School of Engineering, Osaka University, Associate Professor)
Co-Researcher: Hiroyuki Yoshida (Graduate School of Engineering, Osaka University, Assistant Professor)

Research Outline

Liquid crystals having both liquid and crystal properties have already been successfully applied to optical devices and displays because they have orientational order of molecules and high external-field-responsiveness at the same time. The orientational order of the liquid crystal molecules is of the order of nanometer scale, which is sufficient for the its application to an optical device. However, in the application of electronic devices requiring an order of angstrom scale, the molecular order of liquid crystals is insufficient. Therefore, considering soft crystals as an intermediate state between liquid crystals and crystals, we aim to “crystallize” liquid crystal while ensuring the flexibility and mobility of the liquid crystal and create a soft crystal that combines precise orientational order of molecules in angstrom scale and molecular arrangement order of meter scale by self-organization. At the same time, we aim to create new optical and electronic devices based on the synergistic effects of the superior features of both by combining liquid crystals and soft crystals.

From Liquid Crystals to Soft Crystal
Single-Crystal Thin-Film Growth based on Polymorphic Transformation
Participating Group (2018-2019)

Development of Soft Crystals based on Liquid Crystal Science and Exploration of their Novel Functions

Keywords
liquid crystal, organic semiconductor, polymorphic transformation, phthalocyanine, organic electronics
Co-Researcher
Co-Researcher: Akihiko Fujii(Graduate School of Engineering, Osaka University, Associate Professor)
Co-Researcher: Hiroyuki Yoshida (Graduate School of Engineering, Osaka University, Assistant Professor)

Research Outline

Liquid crystals having both liquid and crystal properties have already been successfully applied to optical devices and displays because they have orientational order of molecules and high external-field-responsiveness at the same time. The orientational order of the liquid crystal molecules is of the order of nanometer scale, which is sufficient for the its application to an optical device. However, in the application of electronic devices requiring an order of angstrom scale, the molecular order of liquid crystals is insufficient. Therefore, considering soft crystals as an intermediate state between liquid crystals and crystals, we aim to “crystallize” liquid crystal while ensuring the flexibility and mobility of the liquid crystal and create a soft crystal that combines precise orientational order of molecules in angstrom scale and molecular arrangement order of meter scale by self-organization. At the same time, we aim to create new optical and electronic devices based on the synergistic effects of the superior features of both by combining liquid crystals and soft crystals.

From Liquid Crystals to Soft Crystal
Single-Crystal Thin-Film Growth based on Polymorphic Transformation

Publications

Academic papers/reviewed

A03-15

  1. "Homo/hetero-epitaxial growth in tetrabenzotriazaporphyrin derivative thin film fabricated by contact freezing method with seed crystal", T. Kitagawa, M. Fujisaki, S. Nagano, N. Tohnai, A. Fujii, M. Ozaki, Appl. Phys. Exp., 2019, 12, 051011.
  2. "Uniaxial orientation of poly(3-hexylthiophene) thin films fabricated by the bar-coating method" Y. Yabuuchi, G. Uzurano, M. Nakatani, A. Fujii, M. Ozaki, Jap. J. Appl. Phys., 2019, 58, SBBG04-1-5.
  3. "Carrier transport and device applications of theorganic semiconductor based on liquid crystalline non-peripheral octaalkyl phthalocyanine" M. Ozaki, M. Yoneya, Y. Shimizu, A. Fujii, Liq. Cryst., 2018, 45, 2376-2389.

Related Website(s)
Contact
ozaki[at]eei.eng.osaka-u.ac.jp